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BOB is a company that produces high quality products which
encourage a healthy, outdoor, car-free lifestyle. In addition to
trailers, we also make a full line of strollers.
See www.bobgear.com for our complete line of products.
BOB Trailers can be attached to most bicycles with
wheel sizes between 20” and 29”. Please see the
Trailer/Bike Compatibility chart at the end of your
trailer manual to determine which trailer is compatible
with your bike. If you have questions about your wheel
diameters or trailer compatibility with your bicycle,
consult your bicycle dealer or contact BOB.
• Our trailers are intended to carry cargo only.
• Do not carry children or live animals.
• Cargo capacity: 70 pounds (32 kilograms)
• BOB Nutz must be correctly sized to your specific
bicycle to insure safe operation.
• SPEED LIMIT: 25 mph (40 kph). A bike with trailer
attached steers and feels different. Ride cautiously.
Speed wobbles (and loss of control) can occur if speed
limit is exceeded. The bike and trailer should not
be ridden at a speed greater than is reasonable and
prudent under the conditions and having regard to the
actual and potential hazards then existing.
• Some variables that can affect the control of your
bike and trailer: improper installation of BOB Nutz
/ improper installation of the Pin (shown in FIG. 7)
which holds the Trailer to the BOB Nutz / improper
installation of trailer fork to YAK & IBEX frame / road
conditions / wind speed and direction / cyclist’s skill
level / weight of rider relative to the amount of weight
in trailer / center of gravity of cargo / integrity of all
wheels (proper spoke tension and bearing adjustment).
BOB NUTZ MODELS
Non IGH BOB Nutz have special Identification Grooves (FIG.
1a) that correspond to the axle size for each particular BOB
nut (Table 1). FIG. 1a and 1b also show the anatomy of BOB
Nutz which will assist you during the installation process.
FIG. 1a - BOB Nutz Anatomy
Identication Groove
2 Grooves = 3/8 x 26tpi
1 Groove = 10mm x 1
0 Grooves = 3/8 x 24tpi
Serrated Washer Nut
Bobbin Flat Washer
Lock Washer
M5 Bobbin Retaining
Socket Screw
FIG. 1b - BOB Nutz Anatomy - IGH (Internal Gear Hub)
Nut Bobbin Flat Washer Circlip
Table 1
Model
Axle
Diameter
Thread
Pitch
Common Applications
FIG. 1a
3/8 x 24 3/8” 24 tpi
Single speed coaster brake hubs
3/8 x 26 3/8” 26 tpi
Shimano Nexus 4 and 7 speeds, Shi-
mano 3 speed coaster brakes,
English & Japanese solid axle.
10 x 1 10 mm 1mm
ISO and Japanese solid axles
FIG. 1b
IGH*
10.5
mm
1mm
Sachs multi-speed hubs with indicator
chain shifting
13/32” 26 tpi
Stutmey Archer multi-speed hubs with
indicator chain shifting
*IGH should be installed using manufacturers parts and
maintain correct axle length.
INSTALL BOB NUTZ
Before attempting to attach or use your new trailer, please
read and understand these instructions completely to ensure
proper assembly and operation. If you are unclear on any
point, contact your dealer or BOB before use.
1) Measure Exposed Axle Length
With the bike dropouts fully compressed against the axle
lock nuts, measure the length of exposed axle from the outer
face of the dropout to the end of the axle (See FIG. 2). The
exposed axle length should be between the minimum and
maximum values on Table 2. Repeat this process on both
sides of the axle.
Please see your local bike
shop or contact BOB if you are unclear or cannot take
this measurement accurately.
FIG. 2 - Measure Axle Length
FIG. 6
BOB NUTZ - INSTRUCTIONS
ENGLISH
BOB
®
Trailers, Inc. (800) 893-2447 www.bobgear.com
13501 South Ridge Drive, Charlotte, North Carolina 28273
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OMA33C
Table 2
Product
Minimum Axle Length
Inches (mm)
Maximum Axle Length
Inches (mm)
BOB Nutz 3/8 x 24 tpi 3/8” (9.5 mm) 7/8” (22.2 mm)
BOB Nutz 3/8 x 26 tpi 3/8” (9.5 mm) 9/16” (14.3 mm)
BOB Nutz IGH 9/32” (7.1 mm) 15/32” (11.9 mm)
BOB Nutz 10 x 1 3/8” (9.5 mm) 9/16” (14.3 mm)
If you find that the axle length
on either side does not fall between the minimum and
maximum values, do not continue the installation and see
your local bike shop or contact BOB.
Table 3
Axle Thread
Specification
Overdrop Dimension Range
Inches Millimeters
3/8 x 24 4-1/2” to 5-3/32” (114 mm - 129 mm)
3/8 x 26 5-5/16” to 5-7/8” (135 mm - 149 mm)
10 mm x 1 5-5/16” to 5-7/8” (135 mm - 149 mm)
13/32 x 26 or
10.5 x 1 mm
4-7/16” to 5” (113 mm - 127 mm)
2) Wheel Overdrop
BOB Nutz are designed to work with bicycles having rear wheel
Overdrop Dimension Ranges listed in Table 3.
a. To determine your frame’s Overdrop Dimention, measure
the outside dimension of the rear wheel dropouts using a tape
measure, ruler or a pair of calipers as shown in FIG. 3.
FIG. 3 - Measuring Overdrop
The Overdrop Dimension must fall in the range listed in Table 3.
3) Threading Instructions
a. For IGH models skip to step C.
b. Place the Serrated Washers provided with BOB Nutz over the
axle.
c. Thread on both BOB Nutz in a clockwise direction and tighten
simultaneously to 20-25 ft-lbs (27-34 N-m) of torque. If there is
difficulty, double check to ensure the axle is clean, that you have
the proper size BOB Nutz, and you have not crossed threaded
them.
Now that the BOB Nutz are installed, you are ready to attach the
trailer to the bike.
Attach and detach the trailer
ONLY when it is in a straight line with the bike or you may
bend the fork. It is easiest to attach and detach the trailer
when it is unloaded.
CHECK BOBBIN SPACING
1) With the bike stabilized and the trailer unloaded, check the
fit between the Fork Hooks and the slots of the Bobbins. It is
easiest to do this with the bike in the upright-position and trailer
straight behind the bike. Stand on the non-drive side of the bike
facing towards the trailer. Allow the bike seat to rest against
you. Bend at the hips and lift trailer with both hands, FIG. 4, and
place the Fork Hooks on the BOB Nutz Bobbins.
Pin Correctly Installed
FIG. 4 - Correct Position for Trailer Attachment
a. If the Fork Hooks fit into the Bobbin slots by
expanding or compressing of the fork slightly, skip to
the ATTACH TRAILER section of this manual.
b. If the Fork Hooks do not fit into the Bobbin slots by slightly
expanding or compressing the fork, it will be necessary to
adjust the Bobbin spacing as described in the ADJUST BOBBIN
SPACING section of this manual. FIG. 5 shows a situation where
the Fork Hooks do not fit easily and the Bobbin spacing needs
to be adjusted.
FIG. 5 - Bobbin Spacing NOT Aligned with Fork Hook
Fork Hook
ADJUST BOBBIN SPACING
1) The stainless steel pivoting Bobbins on the BOB Nutz are
asymmetrical as shown in FIG. 1a and 1b. This asymmetrical
design allows the Bobbins to be reversed, allowing for a variance
of approximately 1/2” (12.7 mm) in outside dimensional span of
the bike’s dropouts.
For IGH Models do the following in lieu of steps 1) and 2)
below:
Use a pair of external snap ring pliers to remove the Circlip on
both the right and left sides. Remove the Bobbins and reverse
them noting the positions of the Flat Washer. Then re-install the
Flat Washer and Circlip so it completely engages the slot in the
Bobbin. (Go to step 4)
For Non IGH Models Only:
2) With the BOB Nutz installed, and using a 4mm Allen Wrench,
remove the M5 Bobbin Retaining Socket Screws, FIG. 1a, on
both the left and right sides. Remove the Bobbins and reverse
them noting the position of the Lock Washer and Flat Washer.
3) With the Bobbins reversed, reinstall the Flat Washer, Lock
Washer, and M5 Bobbin Retaining Socket Screw. Tighten the M5
Bobbin Retaining Socket Screws to 35-45 in-lbs (4-4.5 N-m).
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4) Attach the trailer by aligning the slots of the Bobbins with the
slots in the Fork Hooks. FIG. 6 shows the Fork Hooks correctly
installed on the Bobbins.
ATTACH TRAILER
With the Fork Hooks placed on the Bobbins, insert the Pin in the
hole in the front edge of the Fork Hook. Slide the Pin under the
Bobbin and into the hole in the back edge of the
Fork Hook. Rotate the Pin up, toward the Button Head Post
on the Fork Hook. To secure the Pin, it is necessary to press it
downward and toward the Fork Hook. When properly installed,
the Pin fits between the Fork Hook and the head on the Button
Head Post, as shown in FIG. 7. The rubber Lanyard retains the Pin
when it is not installed.
FIG. 6 - Fork Hook Correctly Installed
The Pins are critical to keeping
the trailer attached to the BOB Nutz. Inspect Pins for proper
installation every time you ride. Incorrectly installed Pins can
allow the trailer to detach from the bicycle and cause a
severe accident. Please see your dealer or contact BOB if
you do not understand the Pin installation procedure.
FIG. 7 - Pin Correctly Installed
Pin
Button Head Post
Bobbin
Fork Hook
Lanyard
LIMITED WARRANTY
BOB Trailers, Inc. takes pride in its workmanship and strives to
manufacture the best products possible. Therefore, we warranty
our BOB Nutz against defects in material and workmanship
subject to the conditions listed below. Since no product is
indestructible, it does not cover defects attributable to or
resulting from normal wear, abuse or alteration.
BOB Trailers, Inc. warrants BOB Nutz to be free from defects in
materials and workmanship subject to the following conditions
and limitations:
• Warranty is only valid for the original purchaser.
• BOB Nutz are warranted for one year from date of original
purchase.
• Proof of purchase is required to exercise this warranty.
• Labor and transportation are not included.
• Normal wear, neglect, abuse, accidents, improper assembly
or maintenance, or the installation of parts or accessories not
compatible with the original intended use of the trailer, as sold,
are not covered by this warranty.
• Warranty claims must be made through an authorized dealer.
• This warranty is limited to the replacement of the defective
part. BOB Trailers, Inc. shall in no event be responsible for
consequential or special damages.
• This limited warranty is the only express or implied warranty
applicable to BOB Trailers, Inc. Any implied warranties,
including warranties of merchantability and fitness shall be
limited in scope and duration in accordance with this limited
warranty.
Copyright © 2011 BOB Trailers, Inc.
BOB TRAILERS, Inc.
(800) 893-2447
www.bobgear.com
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